If it is a problem with a DC circuit it has to be a fuse. The fuse compartment on my Scenic Cruiser are all on the front compartment under the drivers side. I believe your coach being a diesel pusher would be the same as mine.
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2002 Gulf Stream Scenic Cruiser
2018 Buick Envision Essence
Neway Freightliner chassis
Aventa II Blue Ox
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